|Diameter:||29.50 mm (13 ligne)|
|Complications:||2-Button, 7-Column Chronograph, Chronograph, Column Wheel Chronograph|
|Hands:||30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Small Seconds Hand at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 1946 – 1950|
Valjoux Cal. 77 ECO is a column wheel chronograph movement. Unusually for Valjoux, it has seven columns in the wheel used to control the chronograph function and also uses Heuer’s oscillating pinion engagement design. It is a two-pusher movement with a 30 minute chronograph register. Cal. 77 was produced from 1946 through about 1950. The Valjoux 92 was a descendent of Cal. 77.
Valjoux designed the unusual Cal. 77 with two goals: It implemented the oscillating pinion for use by Heuer, and it replaced many complex milled components with springs to reduce cost.Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.